You're probably looking for Redmatch 2

Hi everyone!

Redmatch 1 has been neglected for a while as I've spent all my time working hard on Redmatch 2. However, I don't want it to just be forgotten. I've had tons of fun playing Redmatch 1 with friends and I don't want that experience to never be possible again.

Since the game is built with Mono, and therefore easily hackable, I won't be able to maintain official servers and prevent hacking. Because of this, I've modified the existing game using some modding tools to allow private server hosting. You can host your own private server (for free) using Photon.

To set up your server and play with friends:

1. Go to https://www.photonengine.com/
2. Sign in or create an account.
3. Go to https://dashboard.photonengine.com/en-US/
4. Click CREATE A NEW APP.
5. For Photon Type, choose Photon PUN. Name the application anything you want it doesn't matter.
6. Click CREATE.
7. In the list of your applications, copy the App ID of the one you just made.
8. Paste it into the server.txt file.
9. Run the game.

If you want other players to be able to join you, just make sure they have the same App ID in the server.txt file.

There is a server already present in the server.txt file, so if you want you can play on that by default. Be aware that there will probably be hackers there, so just make your own server if you're planning on playing with friends.